If you have multiple applications on Heroku and would like to use a single Logentries account for all of them, this is how you do it. Basically, do not use add-ons, and send all drains to your account.

• In your Logentries account, click on Add Log
• Select Manual
• In the form that appears, input the following:
  • Log Name: access.log
  • Select Set: new set named myapp-{environment}, for instance myapp-staging (at least, this is how I like to name my entries)
  • Select the Plain TCP, UDP - logs are sent via syslog option
  • Click on Create Log Token

Logentries will set the log in discovery mode and assign you an URL and a port, such as data.logentries.com:12455.

Add a Heroku syslog drain and point it to the provided url:

$ heroku drains:add syslog://data.logentries.com:12455 --app myapp-staging

Your log entries will now be available in the newly configured log in Logentries (you may need to hit the Logentries refresh button to see the new events).